McDonald's new ad campaign highlighting its "Favorites Under 400 Calories" isn't just an attempt to highlight its healthier items during the Olympics; it's probably a preview of what's to come from restaurants around the country.

The Nike FuelBand won't hit the market for weeks, but the sultan of swoosh already knows it has a hit. The $149 high-tech wristbands sold out quickly during two short-lived online buying opportunities over the weekend. Here's what all the fuss is about.